Datasheet

11 | Keysight | U1240 Series Handheld Digital Multimeters - Data Sheet
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U1240C Series AC Voltage Specifications
Function Range Resolution Accuracy ±(% of reading + counts of least significant digit)
40 Hz to 1 kHz 1 kHz to 2 kHz
AC voltage
1,4
True RMS
100 mV
2
0.01 mV 1.0% + 3 1.5% + 3
600 mV
2
0.1 mV 1.0% + 3 1.5% + 3
1000 mV 0.1 mV 1.0% + 3 1.5% + 3
10 V 0.001 V 1.0% + 3 1.5% + 3
100 V 0.01 V 1.0% + 3 1.5% + 3
1000 V 0.1 V 1.0% + 3 1.5% + 3
Z
LOW
3
(applicable to 1000 V range)
0.1 V 2.0% + 4 N/A
AC voltage
1,4
Averaging sense
100 mV
2
0.01 mV 1.0% + 5 1.5% + 5
600 mV
2
0.1 mV 1.0% + 5 1.5% + 5
1000 mV 0.1 mV 1.0% + 5 1.5% + 5
10 V 0.001 V 1.0% + 5 1.5% + 5
100 V 0.01 V 1.0% + 5 1.5% + 5
1000 V 0.1 V 1.0% + 5 1.5% + 5
1. Overload protection: 1000 Vrms.
2. 100 mV and 600 mV ranges available on Temperature T1 terminal. The accuracy is specified for 10 MΩ
(nominal) input impedance. The accuracy is specified after NULL function is used to zero out thermal
effect (by shorting test leads).
3. Only available in U1242C only. 1.8 kΩ typical input impedance for Z
LOW
mode.
4. The input signal is lower than the product of 20,000,000 V x Hz.
U1240C Series AC Current Specifications
Function Range Resolution Accuracy ±(% of reading + counts of least significant digit)
40 Hz to 1 kHz (True RMS) 40 Hz to 1 kHz
(Averaging sense)
6
AC current
5
1000 µA
3
0.1 µA 1.0% + 3 1.2% + 5
10 mA
3
0.001 mA 1.0% + 3 1.2% + 5
100 mA
3
0.01 mA 1.0% + 3 1.2% + 5
1000 mA
1,3
0.1 mA 1.0% + 3 1.2% + 5
10 A
2,4
0.001 A 1.2% + 5
4
1.2% + 5
1. Current can be measured up to 440 mA continuously. Maximum of 20 hours for measuring current more
than 440 mA and up to 600 mA. 100 mA and 600 mA ranges have thermal effect of 0.35 µA/mA to be
offset after current applied to these ranges. Cool down the meter for at least 6 seconds if 100 mA was
applied, and at least 3 minutes if 600 mA was applied; or alternatively use the NULL function to zero-out
thermal effect with open test lead before measuring the signal.
2. Current can be measured up to 10 A continuously. Maximum of 30 seconds for measuring current more
than 10 A to 20 A, add 0.3% to specified accuracy. The multimeter needs to be cool down after measur-
ing current that is more than 10 A. Cool down the meter for twice the duration of the measured time and
use NULL function to zero-out thermal effect before proceeding with lower current measurement.
3. 1000 µA to 1000 mA ranges (connection with mA terminal) overload protection by 10 x 35 mm, 440 mA /
1000 V, 10 kA minimum fast-acting fuse.
4. 10 A ranges (connection with A terminal) overload protection by 10 x 38 mm, 11 A / 1000 V, 20 kA
minimum fast-acting fuse.
5. Ensure good ventilation and no heat element close to the meter.
6. The averaging sense is calibrated for sine wave only. Add additional 0.05 counts /°C to accuracy from
–20 0C to 18 0C or –28°C to 55°C.